Growing gourmet and medical mushrooms

Paul Stamets. Growing gourmet and medical mushrooms. - Ten Speed Press, 2000


1. Mushrooms, Civilization and History

2. The Role of Mushrooms in Nature

3.Selecting a Candidate for Cultivation

4. Natural Culture: Creating Mycological Landscapes

5. The Stametsian Model: Permaculture with a Mycological Twist

6. Materials fo rFormulating a Fruiting Substrate

7. Biological Efficiency: An Expression of Yield

8. Home-made vs. Commercial Spawn

9. The Mushroom Life Cycle

10. The Six Vectors of Contamination

11. Mind and Methods for Mushroom Culture

12. Culturing Mushroom Mycelium on Agar Media

13. The Stock Culture Library: A Genetic Bank of Mushroom Strains

14. Evaluating a Mushroom Strain

15. Generating Grain Spawn

16. Creating Sawdust Spawn

17. Growing Gourmet Mushrooms on Enriched Sawdust

18. Cultivating Gourmet Mushrooms on Agricultural Waste Products

19. Cropping Containers

20. Casing: A Topsoil Promoting Mushroom Formation

21. Growth Parameters for Gourmet and Medicinal Mushroom Species

Spawn Run: Colonizing the Substrate

Primordia Formation: The Initiation Strategy

Fruitbody (Mushroom) Development

The Gilled Mushrooms

The Polypore Mushrooms of the Genera Ganoderma, Grifola and Polyporus

The Lion’s Mane of the Genus Hericium

The Wood Ears of the Genus Auricularia

The Morels: Land-Fish Mushrooms of the Genus Morchella

The Morel Life Cycle

22. Maximizing the Substrate’s Potential through Species Sequencing

23. Harvesting, Storing, and Packaging the Crop for Market

24. Mushroom Recipes: Enjoying the Fruits of Your Labors

25. Cultivation problems & Their Solutions: A Troubleshoting guide


I. Description of Environment for a Mushroom Farm

II. Designing and Building A Spawn Laboratory

III. The Growing Room: An Environment for Mushroom Formation & Development

IV. Resource Directory

V. Analyses of Basic Materials Used in Substrate Preparation

VI. Data Conversion Tables






pacity. Air is first filtered through a standard
Class 2 pre-filter. These filters are relatively
coarse, filtering particles down to 10 microns
with 30% efficiency. Pre-filters are disposable
and should be replaced regularly, in most cases
every one to three months. The next filter is usually electrostatic. Electrostatic ifiters vary
substantially in their operating capacities and
airflow parameters Typically, particulates are
filtered down to 1 micron with 95% efficiency.

Electrostatic filters can be removed, periodically, for cleaning with a soapy solution. Their
performance declines as dust load increases. For
most growing rooms of 10,000 to 20,000 cubic
feet, a 25 x 20 x 6 in. electrostatic ifiter suffices
when combined with a fan sending 1000-2000
cubic feet per minute airstream into each growing
room. See Figure 390 for the location of these

9) Filtration of recirculated air Recirculated air from a growing room is relatively free
of airborne particulates during the colonization
phase. When the cropping cycle begins, the air
becomes thick with mushroom spores. (This is

especially the case with Oyster mushrooms
and much less so with Button mushroom culti-

vation.) I have seen the spore load of Oyster
mushrooms become so dense as to literally
stop the rotation of high volume cfm fans!
The design of an air system should allow par-

tial to full recirculation of the air within the
growing room. Usually, a recirculation duct is
centrally located directly below the incoming
air. A damper door controls the degree of recirculation. If the recirculated air is passed through
filters, these filters will quickly clog with mushroom spores, and airflow will radically decline.
If electing to use filters, they should be changed
every day during the cropping cycle. A simple
way of cleaning the recirculated air is to position mist nozzles in the recirculation duct-work.

Figure 396. Close-up of air supply system for grow-

ing rooms featured in Figure 393. Air enters from
below, passing through a coarse and an electrostatic
air filter. A large squirrel cage blower pushes air into

main duct system where two "rain trees" allow the
introduction of cold or hot water into the airstream.
In-house thermostats coupled to solenoid valves
regulate the cold or hot (steam) water supply. Recirculation shutes enter the plenum from the side. The
degree of recirculation can controlled within the
growing rooms. Pre-conditioning the air quality to
70-80% of desired levels is recommended before en-

try into the growing rooms. Provisions for excess
condensation must be engineered into system.

The air will be largely rinsed clean of their spore

load from the spray of water. Ideally, these
downward-flowing nozzles are located directly
above a drain. Having spray nozzles located below the inside roof line and misting downwards
will also facilitate the downward flow of spores
to the floor. This concept can have many permutations.

10) Humidification With the 6-12 air ex-

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